This chapter is a compilation of exchanges gleaned from the Internet:

Question posted:

“Before I had an LCD screen and even before a CRT. On my two previous screens, I had no problem. However, with my new LED, the first night I got it, I had an unexplained strong pain in my eyes.
I spent the afternoon doing research, and I came across many other forumers having the same symptoms with their new LED screens... ”

Answers:

“I had exactly the same type of problem as you with burning eyes after 30 minutes spent on the screen. The screens are now LED, however the result varies greatly from one model to another. »
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« After research I found the exact cause of the problem. LED screens use a system of flashing LEDs to reduce the brightness, which depending on the frequency can actually give headaches (this was my case).
In the end, the solution is therefore to... leave the brightness at 100% on the screen, to possibly lower it via a software solution. To me, that seems to have solved the problem.
To check if your screen is flickering, there are two solutions:

- Put a white background and wave your hand (or a pencil, ...) in front of it. If you have a sort of stroboscopic effect, and therefore clearly distinguish the outlines of the object/your hand at regular intervals => flickering
- Use a digital camera and simply aim at the screen and look at the image on the APN screen: you will see horizontal lines appear (like with good old CRTs)

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Save your eyes

• Enlarge the image and the fonts, and use the full width of the screen by removing all superfluous (markers, footers, etc.).

• Regularly give your eyes rest: cover your eyes with the palms of your hands several times a day and enjoy the relaxation.

• Wear the distance vision every 10 minutes.

The position

• Install your screen so that the light comes from the side. Under no circumstances should you see a window in your field of vision. Also avoid any disturbing reflections.

• Adjust your chair-table setup so that your gaze toward the screen is slightly downward.

• The recommended distance between the eyes and the screen should be between 60 to 90 centimeters.

The luminosity

• Some screens allow the brightness to be reduced to around 80cd/m² knowing that very often we are at 200cd/m². Today's screens tend to be very bright, with popping colors, and that's very bad.

• Look for the most pleasant background brightness and optimum contrast on the screen.
But be aware that a dark mode does not stop blue light.

Eye hydration

• Normally, the frequency of blinking is around 12 to 20 per minute, allowing the formation of a new tear film before the rupture of the previous one. But screen work decreases this frequency and therefore induces drying of the surface of the eyes (aggravated by tobacco and air conditioning).

• Eye drops help moisturize the eye.

• Every 15 minutes, very slowly close-reopen your eyelids completely at least 10 times in order to reinforce the hydration of the cornea of your eyes.

• Blink regularly to avoid staring eyes and to moisturize the eyes.

• Wash your eyes regularly under cool water.

Gymnastic

• Do regular eye exercises :

every hour you have to take your eyes off the screen and move your gaze so as to move from a lighted area to a dark area. You do this for 1 min each time...

• The computer screen produces a static image which forces your pupils to remain permanently in the same position which causes cramps, you have to force them to work from time to time.

blue light

• Computer radiation eats retinal purple (photosensitive pigments) which can be recharged by taking vitamin A => eat fresh carrots.

• The blue light emitted by LEDs is harmful. If the retina, and in particular its center, the macula is endowed with yellow pigments which protect the eyes from the blue emitted by sunlight. If you spend hours in front of a computer, take optical glasses that filter out blue light. Slightly yellow they stop up to 40% of the blue light from the LEDs.

• Some software (sometimes free, such as F.lux) allows you to adjust not only the brightness of the screen but also the intensity of each color, and therefore of blue.

• A tip from Edgar Cayce :

“Potato peelings, applied as a poultice to the eyes, relieve eye fatigue (provided they are kept for two hours, in the dark, applied to the eyes). »